Figure 5.

Comparisons of short- and medium-range order seen in the PDFs: (a) PDFs of TPU-30 and TPU-15 are compared to PDFs measured from previous TPU samples (HP1: 1:1 MDI:BD hard phase, and TPU Shore 60D: 1:0.79:0.21 MDI:BD:PTHF) (note: prior measurements were performed at 100 K).²⁸ The small features around the second NN peak in the previous data are termination effects. (b) TPU-06 is compared to polyamide 6 (PA6).³¹ (c) The long-range ordered signal in TPU-30 is indexed to the hard phase (HP3: 1:1.2 MDI-BD) measured at NSLS (100 K).²⁸ Data sets in (c) were both processed with Q_max = 15 Å^–1 and a Lorch modification for comparison.⁴¹